Grid

Here we may create a grid of calculation points. This is especially of interest for the schematic description of the noise situation in an area, e.g., for noise contour lines. The grid of points is limited by a polygon.

Find it here:

MOUS_ICO Menu: Noise > Calculation points > Grid

or

MOUS_ICO Menu: Noise > Calculation points > Dialog box > Grid

or

nco: Select a calculation point

MOUS_ICO Popup menu: Grid

Identity

See Identity.

Heights

See Heights.

Distance between

• Columns - Distance in meters between the columns in the grid.

• Rows - Distance in meters between the rows in the grid.

Rotation angle

The grid may be rotated to lie e.g. “along” the road. If the grid is rotated this way, this will lead to smoother noise contour lines.

• Value field - An angle (in the current angle units of AutoCAD) may be entered in the nameless value field.

• Choose < - All dialog boxes are closed, and we may specify the angle by picking two points from the map.

Base point

Base point is a reference point for the grid. If the base point is inside the polygon, there will always be created a calculation point in the base point. This may be used for coordinating several grids. E.g. if we want to expand an already defined grid, we may draw another polygon around where we want to expand and then select one of the points in the existing grid as the base point. Use the AutoCAD function Object Snap to get the exact point. The grid will then be adjusted to be an extension of the old grid.

• Choose < - All dialog boxes are closed, and the point may be selected directly on the map.

• X - The X-coordinate of the base point.

• Y - The Y-coordinate of the base point.

• Do not create points within buildings - When set, no calculation points will be created inside of buildings defined in Novapoint Noise. Calculation points meant to be the basis for the calculation of noise contour lines should not be lying within building polygons since they will then be calculated as being on the roof of the building.

Boundary polygon

A polygon must be defined to limit the grid.

• Select polygon < - All dialog boxes will be closed, and a polygon can be selected from the map. When a polygon is selected or <Esc> pressed, we return to the dialog box.

• Draw polygon < - All dialog boxes will be closed, and a polygon can be drawn. By clicking <Enter> or <Esc> we return to the dialog box.

Misc.

• OK - A grid is created with points inside the polygon and with distance and orientation as specified. The creation of points may be interrupted by hitting <Esc>.

• Cancel - The dialog box is closed without any points being created.

Next topic: Heights